Emissive structures and systems

Abstract: An emitter is disclosed. The emitter includes a base layer, where the base layer includes an emissive region of nanocavities and wherein the base layer includes hafnium and nitrogen. A radiation source including the emitter is also disclosed. (end of abstract)

Emissive structures and systems description/claims

Brief Patent Description

Full Patent Description

Patent Application Claims

BACKGROUND

The presently claimed invention relates to emissive structures and related systems.

Conventional tungsten filament lamps exhibit low luminous efficacy (˜17 1 m/W for a 120 V, 750 h, 100 W lamp) compared to plasma discharge or fluorescent lighting sources. In tungsten incandescent lamps only 5-10% of radiation is emitted in the visible spectral range (390-750 nm). The rest is emitted as thermal infrared radiation, primarily in the 750-4000 nm spectral range. The efficiency of the incandescent lamp can be improved by simultaneous enhancement of the radiation emitted in the visible and suppression of the infrared radiation.

Periodic photonic lattices have the unique property that radiation of specific wavelengths cannot propagate through the lattice. Enhanced efficiency in visible wavelengths can be achieved if the photonic lattice is configured to increase visible absorption and/or suppress IR emission. Unfortunately, many of the photonic lattices are limited to low temperature, less than 1000 degrees K, operation due to thermal instabilities.

Therefore, it would be advantageous to develop high temperature emitters with tailored emission properties.

BRIEF DESCRIPTION

In accordance with one aspect of the disclosure, an emitter is disclosed. The emitter includes a base layer, wherein the base layer includes an emissive region of nanocavities and wherein the base layer includes hafnium and nitrogen.

In accordance with another aspect of the disclosure, a radiation source is disclosed. The radiation source includes a base, a light-transmissive envelope coupled to the base, and an emitter including a base layer, wherein the base layer includes an emissive region of a periodic two-dimensional array of nanocavities and wherein the base layer includes hafnium and nitrogen.

DRAWINGS

These and other features, aspects, and advantages of the present invention will become better understood when the following detailed description is read with reference to the accompanying drawings in which like characters represent like parts throughout the drawings, wherein:

FIG. 1 illustrates a schematic view of an emitter in accordance with one embodiment of the present invention;

FIG. 2 illustrates schematic cross-sectional view of an emissive region in accordance with one embodiment of the present invention;

FIG. 3 illustrates schematic cross-sectional view of an emissive region in accordance with another embodiment of the present invention;

FIG. 4 illustrates schematic a top view of an emissive region with a hexagonal lattice of nanocavities in accordance with one embodiment of the present invention;

FIG. 5 illustrates schematic top view of an emissive region with a simple square lattice of nanocavities in accordance with one embodiment of the present invention;

FIG. 6 is a micrograph of a hafnium nitride emitter including a periodic array of nanocavities in accordance with one embodiment of the present invention;

FIG. 7 illustrates measure variation in emissivity with wavelength for a tungsten emitter, a hafnium nitride emitter and a hafnium nitride periodic array of nanocavities in accordance with one embodiment of the present invention;

FIG. 8 illustrates the variation with wavelength of the measured ratio of hafnium nitride nanocavity emissivity with hafnium nitride base layer emissivity in accordance with one embodiment of the present invention;

FIG. 9 illustrates a comparative plot between calculated and measured spectral emissivity for varying cavity diameters in accordance with one embodiment of the present invention;

FIGS. 10-14 illustrate examples of emitter filaments in accordance with embodiments of the present invention;

Continue reading about Emissive structures and systems...
Full patent description for Emissive structures and systems

Brief Patent Description - Full Patent Description - Patent Application Claims

Click on the above for other options relating to this Emissive structures and systems patent application.
###

How KEYWORD MONITOR works... a FREE service from FreshPatents
1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored.
3. Each week you receive an email with patent applications related to your keywords.
Start now! - Receive info on patent apps like Emissive structures and systems or other areas of interest.
###

Previous Patent Application:
Light-emitting substrate and display apparatus using the same
Next Patent Application:
Organic electroluminescence material and element using the same
Industry Class:
Electric lamp and discharge devices

###

Design/code © 2009 FreshContext LLC/Freshpatents.com. Website Terms and Conditions - Also read: About this Page
Patent data source: patents published by the United States Patent and Trademark Office (USPTO)
Information published here is for research/educational purposes only (and in conjunction with our Keyword Monitor) and is not meant to be used in place of the full USPTO patent document/images or a comprehensive patent archive search. Complete official applications are on file at the USPTO and often contain additional data/images (Freshpatents is currently text-only). FreshPatents.com is not affiliated with or endorsed by the USPTO or firms/individuals or products/designs/ideas related to listed patents.

FreshPatents.com Support
Thank you for viewing the Emissive structures and systems patent info.
IP-related news and info

Results in 2.1153 seconds

Other interesting Feshpatents.com categories:
Accenture , Agouron Pharmaceuticals , Amgen , AT&T , Bausch & Lomb , Callaway Golf paws